states supreme court in a major decision, a 5-4 decision, upholds the president's health care reform law. >> you could have imagined the deciding vote was cast by the chief justice himself. conservatives done. liberals perplexed but thrilled. forging ahead, the roberts court takes on same-sex marriage. >> number nine, yahoo ceo marissa meyer. at 37, head of a major tech company, a ceo in a male-dominated field, pregnant. it's the baby part that became problematic, shall we say, when meyer decided to take just a couple weeks for maternity leave. the mommy blogosphere went nuts. sure, she could be woman in charge, but what message was she sending by not staying home longer with her baby? >> number eight, south korean rapper psy. ♪ gangnam style >> say what you want, his lasso inspired lance style first discovered on youtube, had everyone going gangnam, and we mean everyone. >> the lasso again. then the horse back. >> gangnam style. >> psy was riding high in 2012, star performer in the most watched youtube video of all time. >> number seven, republican presidential candidate mitt romney.